Post request - session expire.

[vladutteo]

Because i had a big problem with the session token, because the token expire in 1 minute, i will post the solution here.
After few hours of searching i found an solution. We need to use app-bridge-utils. We need to send the token in every request we made.

Example:
` utils.getSessionToken(app).then(token => {

        let params = '&param=someting&param2=something2';

        let xhttp = new XMLHttpRequest();

        xhttp.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
                 // DO SOMETHING
            }
        };

        xhttp.open("POST", "/save-keys");
        xhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
        xhttp.send(`token=${token}${params}`);


    });`

That's how the token will be taken before as the request to be sent. :)